A government spokesman Nasser Judeh said it appeared the attack was an "individual act" and that the gunmen had "no links with domestic or foreign" terrorist groups, the Associated Press reported.

The man has been named as Nabil Ahmed Issa Jaourah, 38, who officials say comes from a village just outside Zarqa, a centre for Islamic militants, from where the killed al-Qaida in Iraq leader, Abu Musab al-Zarqawi, hailed.

'Bleeding all over'

The attack took place at 1230 local time (0930 GMT).

Eyewitnesses said the attacker, said to be a Jordanian, approached the tourists shouting "God is great" in Arabic before firing at least 12 shots at the small group of tourists.

When his ammunition ran out, the gunman fled into the crowds before being arrested, eyewitnesses said.

Briton Karen Sparke, who survived the attack, told the BBC that when she heard the gunfire she initially thought a firecracker had been let off.

She then turned around and saw a man pointing a gun at the group.

"I don't remember much about it," she said. "Just that I was shot and as I looked my other friends were on the floor laying down, and then I went up the steps a bit further and stood round the corner and then realised that I was bleeding all over."

As well as the tourists, a member of the local tourist police was injured.

'Callous'

UK Foreign Secretary Margaret Beckett said she was "extremely saddened" by news of the attack.

"My sympathies are with the victims and their families. Acts of violence such as this are as senseless as they are callous," she said.

The BBC's Jon Leyne says local people joined in the struggle to overpower the gunman.

The area surrounding the Roman amphitheatre has been sealed off and anti-terrorist police are patrolling the site.

British tourists visiting Jordan are warned by the UK Foreign Office of a "high threat of terrorism", with Westerners being a particular target.

Jordan's tourist trade has been badly hit by reaction to the conflict in Lebanon, although tour operators say it remains popular with more adventurous travellers.

The amphitheatre, cut into a steep hill in the centre of Amman, is the Jordanian capital's top tourist attraction.